16.3 Point Symmetry and Tests for the Parallelogram
Point 3 of 5
16.3.3 The Parallelogram Is Point-Symmetric
Core idea
Turn it a half-circle about where the diagonals cross and it covers itself exactly, so that crossing point is its center of symmetry
Module goal. Introduce point symmetry as a fresh way of seeing symmetry, explain why a parallelogram has it, and systematically build up the various ways to test for one
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